[CentOS] Print stuck in queue

I have some prints stuck in my print queue from firefox.

I can ping the printer (HP 7310 accessable over 9100). Windows systems 
can print.

I just tried sending a print from OpenOffice Writer and Unable to Write 
Print Data:  Broken Pipe

I tried restarting CUPS, no change.

What can I do?  I don't think I should have to reboot.